Waste water treatment plants take in a large amount of debris which must be removed prior to treatment.  Grit chambers are sedimentation basins that filter out smaller debris such as coffee grounds, sand, and other materials that would damage equipment in the plant further along in the treatment process.  The performance of these chambers can vary depending on the configuration of the system.  Our team has experience in the modeling of grit chambers by computational fluid dynamics.  In our project, the grit chambers were not operating as expected due to the internal hydraulics of the structures and intake system.  Secondary recircluation zones perpendicular to the flow direction caused grits to be resuspended reducing the lifespan of the pumps.  Our research resulted in the adoption of modifications to the system to prevent resuspension.